PDF malware analysis — malicious · 3a229bee08975dae

MALICIOUS

PDF

118.7 KB

MD5: 9b3971cc65ad2bd8c3837f35a0d4c571 SHA-1: 1dbbe255eb9585df7cbfec729d2bfa38afdac8bb SHA-256: 3a229bee08975dae87403a8ec2144040b4fd86287b23b934b1a9b1f55ec73f0f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. This suggests the primary function of the PDF is to download and execute a secondary payload. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086', further confirming its malicious nature. No specific URLs or hashes were extracted, limiting the IOCs.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `5ab7c207fe27bfeb5d88700f551b18becd92f5bc1678c8a9c0feda644aa0472f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627202 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9d3d0402ca9fae31c24b021f724fb55a58b82e6f262efc2b840bd554e956d2b0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 591 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `da9beade4880860c7fbc03e99afdc1a72c9a8a9e6bf3b48afe7bd575720c01cf`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 517 long base64-like blob(s).

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